Lamp housing with high pressure gas discharge lamp



E- GOTZE March 16, 1965 LAMP HOUSING WITH HIGH PRESSURE GAS DISCHARGE LAMP Filed NOV. 1, 1962 United States Patent Claims. ci. 240-46.53)

The invention relates to a lamp housing for a picture projecting apparatus and particularly is directed to a lamp housing containing a high pressure gas discharge lamp as a source of light and which is constructed to be attached to a picture projecting apparatus.

In the event that a conventional motion picture projector equipped with a carbon arc lamp is to be converted for use with a high pressure gas discharge lamp it is necessary to make provision for compensating the different distances of the base plates of the lamps with respect to the optical axis of the projector. In fact, it is required that the conventional high pressure gas discharge lamp unit be provided with a base plate which may be adjusted in a vertical direction.

In some cases it is difficult to obtain the required vertical adjustment of the high pressure gas discharge lamp unit, namely then, when the difference between the distances of the optical axis of the high pressure gas discharge lamp and the projector table surface, on one hand, and between the projector table surface and the optical axis of the projector, on the other hand, exceeds the customary difference, so that even the insertion of shins between the projector table surface and the lamp housing does not lead to the desired result.

It is an object of the invention to provide the lamp housing of a picture projecting apparatus with a source of light comprising a high pressure gas discharge bulb and a mirror optic for the same, and to provide this source of light with means for adjusting the same vertically as a unit, and furthermore, to provide the lamp housing with a vertically adjustable light passage means in the form of a tubular member which is mounted for vertical adjustment on the lamp housing and faces the picture window of the projector. Such a double vertical adjustability of a source of light and a light passage means permits a most versatile and favorable adjustment of a high pressure gas discharge lamp with respect to the optical axis of any available picture projecting apparatus which is to be converted from carbon arc lamp operation to high pressure gas discharge lamp operation.

With this and other objects in view, as will appear hereinafter, the invention will now be described in the following specification with reference to the accompanying drawing, in which FIG. 1 illustrates diagrammatically and by way of example a side elevation view of a lamp housing of the invention, with one side wall removed so as to show the high pressure gas discharge lamp and its associated parts, and

FIG. 2 shows a partial sectional view of the lamp housing in an enlarged scale.

Referring to the drawing, the lamp housing 1 is of substantially rectangular shape and has a light passage aperture 13 in its front wall 14 which latter has attached to its outer face a conical sleeve or hood 8 which is directed toward the picture projecting apparatus (not shown). Within the lamp housing 1 are mounted the two parts of a mirror optic Z, 3 and the bulb of a high pressure gas discharge lamp 4. All these parts 2, 3 and 4 are mounted on a vertically adjustable horizontally disposed base plate 5. A number of vertically disposed pins, such as threaded ice bolts 7, extend through the base plate 5 and along which the base plate is vertically adjustable in any desired manner. As shown by way of example, the base plate 5 is held in the desired vertically adjusted position by nuts 6 or" which two are threaded on each bolt 7 until they engage the upper and lower faces of the base plate 5. The lower ends of the bolts 7 are supported by the bottom wall 18 of the housing. By moving the nuts 6 along the bolts 7, the base plate 5 and therewith the entire lamp structure is adjusted vertically in the direction of the double arrow 16 shown in FIG. 1.

The conical hood 8 is provided on the end attached to the front wall 14 of the lamp housing 1 with an outwardly extending flange 10 which is provided with a number of vertically extending slots 12. Mounting screws 9 pass through these slots 12 and are threaded into suitably threaded bores 11 in the front wall 14. Upon loosening these screws 9 somewhat, the hood 8 may be adjusted vertically in the direction of the double arrow 15 with respect to the aperture 13, and then the hood 8 may be secured in the desired position by tightening the screws 9.

It is believed to be obvious that upon adjustment of the nuts 6 along the threaded bolts 7 the center or axis of the source of light mounted on the base plate 5 may be adjusted so as to coincide with the optical axis of the objective of the projector. An additional adjustment of the lamp housing is possible by vertically adjusting the hood 3 until its axis coincides with the optical axis of the objective of the projector.

What I claim is:

1. In combination with a lamp housing for a picture projecting apparatus in which said housing is provided with a bottom wall and a front wall, a high pressure gas discharge lamp conversion unit for said housing to replace the arc lamp thereof, comprising a high pressure gas discharge lamp, mirror optical members mounted on said base plate and supported relative to said discharge lamp to project a light beam from said lamp toward said front wall, a horizontally disposed base plate removably mounted on said bottom wall on which said lamp and mirror optic are mounted, means for mounting said base plate for vertical adjustment within said lamp housing, said front wall having a light passage aperture arranged in front of said lamp, a tubular hood mounted on said front wall in substantially axial alignment with said light passage aperture, and bolt and slot means for vertically adjusting said hood along said front wall whereby the axis of the light beam and hood can be properly adjusted to direct a light beam to the picture strip of said apparatus.

2. In combination with a lamp housing for a picture projecting apparatus in which said housing is provided.

with a bottom wall and a front wall, a high pressure gas discharge lamp conversion unit for said housing to replace the arc lamp thereof, comprising a high pressure gas discharge lamp mirror optical members mounted on said base plate and supported relative to said discharge lamp to project a light beam from said lamp toward said front wall, a horizontally disposed base plate removably mounted on said bottom wall on which said lamp and mirror optic are mounted, means for mounting said base plate for vertical adjustment within said lamp housing, said front wall being provided with a light passage aperture arranged in front of said lamp, a tubular hood mounted on said front wall in substantially axial alignment with said light passage aperture, and bolt and slot means for vertically adjusting said hood along said front wall, said last mentioned adjusting means comprising an outwardly extending flange on that end of said tubular hood which is positioned adjacent said front wall, said flange being provided with vertically elongated slots, and

threaded-fastening boltmernbers extending through said said base plate and supportedrelative torsaid dis harge a lamp to projectalight beam from said lamp toward said front wall, a horizontally disposed base plate removably' m nted on said bo tomwall o i'wh ch i la pl mirr opt c is mounteimeam fo mou n'g said base plate for vertical adjustment within said lamp housing, said, mounting means comprising a number of vertically extending threadedlegs whichextend through the corners of said base plate and-which are supported with their lower ends by. said bottom wall fthe housing, an c amp n nut h ade n ai s en opp s Sides of saidiplate 'for adjusting said base. plate along said threaded legs and securing saidcbase platein the adjusted position, said lamp housing having a vertical front wall with a light passage aperture arranged in front of said position, said vertical front wall of said housing provided with alight passage aperture arranged in front of said lamp, a tubular hood mounted on said front wall in substantially'axial alignment with said light passage aperture, and bolt and slot means for vertically adjusting said hood along said front wall; said last mentioned adjusting means comprising-an outwardly extending flange on thatend of said tubular hood which is positioned adjacentsaid frontiwall, said flange being provided ,with vertically elongated slots, and'threaded fasteningmembers extending through said slot'siand into correspondingly threaded openings in said tront wall and permitting a vertical adjustment of said hood within the range of said vertically. extending slots .whereby the axis of the light 'bearnand hood can be properly adjusted to direct a light 'beam 'to the picture strip of, said, apparatus.

5; In combination ,with the lamp housing of amotion pictureprojectorvin:which said housingis provided with lamp, a tubular hood mounted on said front wall in substantially axial alignment with said light passage aperture, and means for vertically adjusting said hood along said front wall whereby the axis of the lightbeam and hood can-be properly adjusted to direct a light'beam,

to the picturestrip of said apparatus.

4. In combination with a lamp housing fora picture projecting apparatus in which said housing is provided with a bottom walland a front wall, ahigh pressure gas discharge lamp conyersion'unit'for said housing to replace the 'arc lamp thereof, comprising a high pressure gas discharge lamp mirror opticalmembers mounted, on said base plate and supported relative tosaid discharge lamp to project a light beam from said lamp toward 7 said front wall,ta horizontally disposed base plate removably mounted on said bottom wall-onwhich said lamp and mirror optic is mounted, means for mounting said base plate for vertical adjustment within said lamp housing, said :mountingmeans comprising a number of -a:bottom.wall Land .avertical' front wallhaving alight aperture therein, a gaseousdischarge [conversion unit torreplacingthe arc' lamp of "saidprojector, comprising a horizontal base plate removably mountedin said-housingand adapted to. be supported by thebottorn wall thereof, a gaseous discharge lamp supported on said base plate and =extendingupwardly therefrom, mirror optical members mounted, on said base plateandsupportedrelative to said discharge'lamp to project-alight beam from said lamp through said aperture, said baseplate being provided at the corners with.-openings, a threaded sup,-

por'ting leg extending through i each of said. openings, clamping nuts threaded onsaidlegs on opposite sides of said plate to permit the same to be adjusted with. respect arrangement; being such that the hood and conversion unit can be adjusted to'properly direct a light beam toward thepieture projecting apparatus and illuminate the picture strip thereof.

- 7 References Cited by the Examiner UNITED, :STATES JPATENTS 7 1,667,949 5/28 Ring 240'4 6.53 1,768,250 6/30 Guin 24046.53 1,964,591 "6/34 Nanfeldtp 8824 2,292,966 8/42 Osterberg et al. 88.--2,6

NGRTON ANSI-1BR, Primary Examiner. 

1. IN COMBINATION WITH A LAMP HOUSING FOR A PICTURE PROJECTING APPARATUS IN WHICH SAID HOUSING IS PROVIDED WITH A BOTTOM WALL AND A FRONT WALL, A HIGH PRESSURE GAS DISCHARGE LAMP CONVERSION UNIT FOR SAID HOUSING TO REPLACE THE ARC LAMP THEREOF, COMPRISING A HIGH PRESSURE GAS DISCHARGE LAMP, MIRROR OPTICAL MEMBERS MOUNTED ON SAID BASE PLATE AND SUPPORTED RELATIVE TO SAID DISCHARGE LAMP TO PROJECT A LIGHT BEAM FROM SAID LAMP TOWARD SAID FRONT WALL, A HORIZONTALLY DISPOSED BASE PLATE REMOVABLY MOUNTED ON SAID BOTTOM WALL OF SAID WHICH SAID LAMP AND MIRROR OPTIC ARE MOUNTED, MEANS FOR MOUNTING SAID BASE PLATE FOR VERTICAL ADJUSTMENT WITHIN SAID LAMP HOUSING, SAID FRONT WALL HAVING A LIGHT PASSAGE APERTURE ARRANGED IN FRONT OF SAID LAMP, A TUBULAR HOOD MOUNTED ON SAID FRONT WALL IN SUBSTANTIALLY AXIAL ALIGNMENT WITH SAID LIGHT PASSAGE APERTURE, AND BOLT AND SLOT MEANS FOR VERTICALLY ADJUSTING SAID HOOD ALONG SAID FRONT WALL WHEREBY THE AXIS OF THE LIGHT BEAM AND HOOD CAN BE PROPERLY ADJUSTED TO DIRECT A LIGHT BEAM TO THE PICTURE STRIP TO SAID APPARATUS. 